G&W Electric GRAM 的垫座和保险库开关设备具备负载断开切换能力，具备可见断开和集成接地位置，采用完全密封的潜水式死前装置。集成的接地位置消除了处理高压连接以接地电缆的需求。这些开关设计用于电压最高38kV、900A负载断路和连续电流的三相系统。这些开关极其灵活，提供多种款式。交换机通常在前端销售，操作员在前端。高压连接可以安装在底部、顶部或侧面，以便于电缆训练和安装。
这些交换机按照IEEE C37.71和C37.74设计，具备负载断开能力。垫装外壳设计并测试符合IEEE C57.12.28和C57.12.29标准。探索GRAM的挂盘和保险库 开关设备 如何融入我们的综合开关设备解决方案，为多样化的电力分配需求提供可靠性和灵活性。
建设 可选紧凑型结构，前置可访问开关操作员和套管。拱顶结构也可选配顶部或底部衬套，或顶部可接入操作员和衬套。
地面位置 所有方向都集成接地位置，避免了高压元件的接地需求。
自动化 适用于电动机自动化，配备便携式或永久安装的电机和控制装置。G&W Electric的编程和箱体制造提供了多种继电器，如SEL、ABB和GE。柜体可订购为低压外壳，用于安装垫、底座或IP68级潜水器，用于穹顶安装开关设备。提供自动源传输或激光器定制解决方案的编程。
可见断裂 所有航道均配备可见的断裂点，可查看开启、封闭和地面位置。
电压感应 可配备集成电压感应系统，用于电压指示面板以确定同相状态，或用于继电器，精度可达1%。
| # of Ways | One-line Diagram (Horizontal) | Voltage Class (kV) | Close Into Fault (kA asym)/strong> | Catalog Number | Approximate | |
| Width* in. (mm) | Wt. w/SF6 lbs (kg) | |||||
| 2 |  | 15 | 32 | GRAM21-376M-40RP | 29 (737) | 700 (318) |
| 40 | GRAM21-376M-40PI | 32.5 (825) | 600 (270) | |||
| 25 | 32 | GRAM21-386M-40RP | 29 (737) | 700 (318) | ||
| 40 | GRAM21-386M-40PI | 32.5 (825) | 600 (270) | |||
| 35 | 32 | GRAM21-396M-40RP | 29 (737) | 700 (318) | ||
| 40 | GRAM21-396M-40PI | 32.5 (825) | 600 (270) | |||
| 3 |  | 15 | 32 | GRAM33-376M-40RP | 40.5 (1029) | 950 (431) |
| 40 | GRAM33-376M-40PI | 62.25 (1580) | 1400 (635) | |||
| 25 | 32 | GRAM33-386M-40RP | 40.5 (1029) | 950 (431) | ||
| 40 | GRAM33-386M-40PI | 62.25 (1580) | 1400 (635) | |||
| 35 | 32 | GRAM33-396M-40RP | 40.5 (1029) | 950 (431) | ||
| 40 | GRAM33-396M-40PI | 62.25 (1580) | 1400 (635) | |||
| 4 |  | 15 | 32 | GRAM44-376M-40RP | 52 (1321) | 1200 (544) |
| 40 | GRAM44-376M-40PI | 80.5 (2045) | 1800 (815) | |||
| 25 | 32 | GRAM44-386M-40RP | 52 (1321) | 1200 (544) | ||
| 40 | GRAM44-386M-40PI | 80.5 (2045) | 1800 (815) | |||
| 35 | 32 | GRAM44-396M-40RP | 52 (1321) | 1200 (544) | ||
| 40 | GRAM44-396M-40PI | 80.5 (2045) | 1800 (815) | |||
| 5 |  | 15 | 32 | GRAM55-376M-40RP | 63.5 (1613) | 2500 (1136) |
| 40 | GRAM55-376M-40PI | 98.75 (2510) | 2200 (1000) | |||
| 25 | 32 | GRAM55-386M-40RP | 63.5 (1613) | 2500 (1136) | ||
| 40 | GRAM55-386M-40PI | 98.75 (2510) | 2200 (1000) | |||
| 35 | 32 | GRAM55-396M-40RP | 63.5 (1613) | 2500 (1136) | ||
| 40 | GRAM55-396M-40PI | 98.75 (2510) | 2200 (1000) | |||
| 6 |  | 15 | 32 | GRAM66-376M-40RP | 75 (1905) | 2600 (1182) |
| 40 | GRAM66-376M-40PI | 117 (2970) | 2600 (1180) | |||
| 25 | 32 | GRAM66-386M-40RP | 75 (1905) | 2600 (1182) | ||
| 40 | GRAM66-386M-40PI | 117 (2970) | 2600 (1180) | |||
| 35 | 32 | GRAM66-396M-40RP | 75 (1905) | 2600 (1182) | ||
| 40 | GRAM66-396M-40PI | 117 (2970) | 2600 (1180) | |||
| For rotary puffer (RP): Tank depth= 25″ (635mm), Tank height = 27″ (686mm) | ||||||
| For linear puffer (PI): Tank depth= 34″ (865mm), Tank height = 32″ (815mm) | ||||||
| *Dimensions are approximate and do not include entrances, gauges, frames, or operators | ||||||
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